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【单选题】
在一个select-from-while语句的where子句或having短语中,又出现了另一个select语句,这种查询称为____。A.
嵌套查询
B.
连接查询
C.
查询
D.
父查询
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反馈参考答案：
举一反三
【单选题】Children are advised to _________ their food carefully in their childhood. .
A.
chew
B.
digest
C.
swallow
【单选题】Parents are advised to put books __________ they are easily accessible to children .
A.
which
B.
where
C.
in which
D.
who
【简答题】In America, most people don’t get enough sleep. Children aged 5 to 12 are advised to sleep 10 to 11 hours every night, but most of them can’t sleep that long. A study found that about 41 million Ameri...
【单选题】If children have flulike symptoms, their parents ______.
A.
are advised not to give them aspirin
B.
should watch out for signs of Reye syndrome
C.
are encouraged to take them to hospital for vaccination
D.
should prevent them from mixing with people running a fever
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